Add use-sequence-for-iteration checker

[cdce8p]

Type of Changes

	Type
✓	✨ New feature

Description

Part of #4776 (comment)
It is more efficient to iterate over sequence types than sets.

# old
for x in {1, 2, 3}:  # [use-sequence-for-iteration]
    pass

# better
for x in (1, 2, 3):
    pass

[coveralls]

Pull Request Test Coverage Report for Build 1125844000

• 10 of 10 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.004%) to 92.647%

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Totals
Change from base Build 1125375963:	0.004%
Covered Lines:	13318
Relevant Lines:	14375

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💛 - Coveralls

[cdce8p]

@Pierre-Sassoulas This would be the first new check for #4776. What do you think?

--
My plan is to do a followup were I limit consider-using-tuple to only lists. That way we prevent double warnings. Especially considering use-sequence-for-iteration is enabled by default.

[Pierre-Sassoulas]

LGTM !